Protective mask



FIG. 1 is a front perspective view of a protective mask showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof, the left side being a mirror image;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The details shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for the protective mask, as shown and described. 